I had a GFX. I hated it. It isn't user friendly at all. Worst part is its battery life. I gave it away, didn't even have the heart to charge anybody for it. I use a Neptune 2, although a hate the logbook, it's not user friendly at all, but Ive got a couple hundred jumps on both and I'd check out the N@ or maybe look into that new N3 if you can afford a million dollar altimeter;)